I'll give you points for obvious originality, but frankly some work is needed.

First off, this pairing. I have no exact idea why this was created, or what the point is. Crossover much? Anyway, the pairing makes no sense, and it shows. Now, onto the anatomy. The hands are way to wiggly and arent bent enough. They don't even look like they are holding the pencil! Also, the hand tails isn't using to write with looks odd and in a forced position. Now, onto the characters. I know tails very well (as I'm a sonic fan) and he wouldn't react like that. And also, is that really tails or it just some guy in a fox costume? Because it looks like he has a costume on from the collar around his neck. (And if you drew him as an actual animal, this would have probably been classified as bestiality, since you are shipping these two together, but since he is a humanize tails, I'll give you some slack.) But there aren't too many anatomy flaws and that looks like a realistic reaction from rin.

Overall, the reason for these two being shipped and the odd anatomy, as well as what tails is doing kinda ruins this picture. But overall, it's a decent piece.

ah its from a vocaloid saga called kagerou daze that now has its own manga and novel i said it because the main character (shintaro) its a genius with a CI of 168 and his crush (ayano) is a little dumb i say it because of this song: